Hirshhorn Museum and Sculpture GardenMuseum of international modern and contemporary art, with over 60 works of art in the outdoor sculpture gardenAddress: Independence Avenue at 7th Street, SWClosest Metro Stop: L'Enfant Plaza (Blue/Orange lines and Yellow/Green lines) Availability: The museuem is open daily from 10:00 a.m.-5:30 p.m. The plaza is open daily from 7:30 a.m.-5:30 p.m. The sculpture garden is open daily from 7:30 a.m.–Dusk. Closed Christmas Day.Cost: FreeMore Information:www.hirshhorn.si.edu

National Air and Space MuseumMaintains the largest collection of historic air and spacecraft in the worldAddress: Independence Ave at 4th Street, SWClosest Metro Stop: Smithsonian (Blue/Orange lines) or L'Enfant Plaza (Blue/Orange lines and Yellow/Green lines) Availability: Open daily from 10 a.m.-5:30 p.m. Closed on Christmas Day.Cost: FreeMore Information: www.nasm.si.edu

National Museum of American HistoryThe National Museum of American History collects artifacts of all kinds—from gowns to locomotives—to preserve for the American people an enduring record of their past. The Museum has more than 3 million artifacts in its collection.Address: 14th Street and Constitution Avenue, NWClosest Metro Stop: Smithsonian (Blue/Orange lines) or Federal Triangle (Blue/Orange lines)Availability: Open daily from 10:00 a.m.-5:30 p.m. Closed on Christmas Day. Cost: FreeMore Information:www.americanhistory.si.edu

National Museum of the American IndianThe National Museum of the American Indian is dedicated to preserving the understanding and knowledge of the culture and history of the Native Americans of the Western Hemisphere, past, present, and future through partnerships with the native people.Address: 4th St. and Independence Ave., SWClosest Metro Stop: L'Enfant Plaza (Blue/Orange lines and Yellow/Green lines)Availability: Open daily from 10:00 a.m.-5:30 p.m. Closed on Christmas Day.Cost: FreeMore Information:www.nmai.si.edu

National Museum of Natural HistoryThe National Museum of Natural History is dedicated to understanding the natural world and our place in it.Address: 10th Street & Constitution Ave., NWClosest Metro Stop: Smithsonian (Blue/Orange lines)Availability: Open daily from 10:00 a.m.-5:30 p.m. Closed on Christmas Day. Cost: FreeNotes: www.mnh.si.edu

National Postal MuseumThe National Postal Museum, a Smithsonian Institution museum, is located in the old Post Office building next to Union Station in Washington, DC.Address: 2 Massachusetts Ave., NEClosest Metro Stop: Union Station (Red line)Availability: Open daily from 10:00 a.m.-5:30 p.m. Closed on Christmas Day.Cost: FreeMore Information: www.postalmuseum.si.edu

Steven F. Udvar-Hazy Center (National Air and Space Museum)Near Washington Dulles-International Airport, this is the companion facility to the National Air and Space Museum on the National Mall. It provides enough space for the Smithsonian to display the thousands of aviation and space artifacts that cannot be exhibited on the National Mall.Address: 14390 Air and Space Museum Parkway, Chantilly, VA 20151Closest Metro Stop: Shuttles are available from Vienna-Fairfax (Orange line)Availability: Open daily from 10 a.m.-5:30 p.m. Closed on Christmas Day.Cost: FreeMore Information: www.nasm.si.edu/museum/udvarhazy